package bean; import java.util.Date; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.Table; import javax.persistence.Temporal; import javax.persistence.TemporalType; @Entity @Table(name="Table_Email2") public class Email { private int id; private Date registerdate; private String server; public Email() { } public void setId(int id) { this.id = id; } @Id//使用注解标识主键 public int getId() { return id; } public void setRegisterdate(Date registerdate) { this.registerdate = registerdate; } @Temporal(TemporalType.TIME)//表示时间,用不同属性 可以表示时间的不同精度 public Date getRegisterdate() { return registerdate; } public void setServer(String server) { this.server = server; } @Column(name="_server",length=3)//更改在表中显示的列名 public String getServer() { return server; } }